Connecting rod



Aug. 19, 1930.

M. J. CLARK CONNECTING ROD Filed Aug. 8, 1927 INVENTOR. Mex J. 64/021:

AfTORNEY.

MAM-m.

Patented Aug. 19, 1930 UNITED "STATES PATENT OFF-ICE MAX J. CLARK, or roN'rIAc, MICHIGAN, ASSIGNOR TO THE wILLYs-ovERLANn conirANY, or TOLEDO, OHIO, A ooRronA'rIoN or OHIO CONNECTING Ron Application filed August 8,

My invention relates to the manufacture'of metallic elements having conduits therein, and it has particular application to the fabrication of connecting rods for internal com bustion engines which are formed with oil passages interconnecting the wrist pin and crankshaft bosses.

It has been suggested that hollow connectingrods be manufactured without the conventional drilling operation by forging the rod to include one or more flanged portions which are disposed adjacent a recessed portion, and subsequently bending over the flanged portion and sealing the line of contact without filling up the recessed portion. Holes are drilled through the boss portions to connect the bearing surface with the con- 'duit along the shank of the'rod thus formed. As an alternative of the above method of manufacture, it has been suggested that the recess be formed by a suitable milling operation.

Certain diificulties are-experienced in the manufacture of rods according to the method aforementioned. Thus it has been found that the comparatively deep recess approxi mately disposed with respect to the flanged portions,.weakens the dies materially resulting in their frequent breakage. This unde- Another object of the invention is to provide a connecting rod having an oil communieating duct extending between the boss portions, in which the brazing and drilling oper' ations are materially reduced.

It is a further object of the invention to provide a connecting rod having an oil communicating passage extending between the boss portions formed by adjacent recessed 1927. Serial No. 211,308.

and flanged portions, and having means for preserving and reinforcing the passage thereby insuring an unobstructed conduit for thepassage ofthe lubricating fluid. These together with other'objects, will become more which the tube and oil communicating passages are assembled in operative relation.

Fig. III is a sectional view of-a connecting rod taken along a line corresponding to' line III'II I in Fig. I, in which the interconnecting tube isdisposed in its final position and likewise illustrates the relation of the flanged portions with respect to the tube in their final position, and

Fig. IV is a sectional view corresponding to that illustratedin Figure III of the modification of the embodiment illustrated in the first three figures. I

In practicing the present invention the connecting rod is forged after the manner of the conventional rod, differing only in that the shank is provided with a comparatively deep recessed portion immediately adjacent a comparatively high flanged portion. Thus in the drawings there is illustrated a shank portion 10 having arecess' 11 disposed between two symmetrical flanged portions 12., A wrist pin boss 13 and a crankshaft boss 14 are formed integrally with the ends of the shank and are provided with drilled holes 16 which interconnect the bearing surfaces with the recess of the shank. i

Following the drilling operation, a tube 17 or a suitable reinforcing means is disposed within the recess and connected with the oil holesin the boss. Subsequently, the adjoina" .'ing surfaces in-the boss members may be brazed after which the extended flanges are bent about the tubular reinforcing meansin the manner illustrated in Fig. III.) If it is desir d, a sin le, fl ng 2 of somew a brazing than is necessary in the unreinforced rod, inasmuch as the connections between the tubular means andthebosses alone require arseal, particularly if the reinforcing means iBEOiifl closed tubular construction.

I 1 Aithough there is illustrated but a single f the Principles of my inveniflmiitmill be, apparent to those skilled in the wtrfrom t description thereof, that theyrt rfii'not limited to the specific embodiment disclosed, but ma be applied to many fwdelfldifluent embo iments, and I desire A og-g thattheiinvcntion be limited only as indicated by the prior art and the appndedcleims.

" I claim d. A connecting rod. for internal combustion. 'nes comprising a longitudinal recessegsi ank having an adjoining flange ex- -te over. therrecesaa wrist pin boss and ac shaft .boss eaeh having oil passages therein and each fbrmed integrally with the endeof the -shank,"a conduit sposed within aaidil'ecessrandsecuredrtherein by said flange, said conduit interconnecting the oil passages inzthe bosses- Ba-A connecting tion. es comprising a shank having wrist within said recess forming a seal between the extremities of said flan es.

5. A connecting rod or internal combustion engines comprising a shank having hearing bosses on the ends thereof, longitudinal flanges on said shank having their extremities positioned closely adjacent each other to form a substantially closed passage between said flanges and said shank, and means dis- 7 posedwithin said passage forming a seal between the extremities of said flanges.

6. A connecting rod for internal combustion engines comprising a shank having bearing bosses on the ,ends thereof, a tube positioned along said shank and communicating with said bosses, and flanges on said shank on opposite sides of said tube, said flanges extending around said tube to secure the same to said shank. A

In testimony whereof I aflix my si nature.

MAX J. C RK.

rbd for internal combuspin an crank shaft bosses on the ends thereextra tube positioned alongsaid shank adapted to convey fluidfrom one end of the rod L *toitheiithermnd a longitudinal flange on said a around a portion of the surm'ee of said tubeto permanently secure the same to said shank.

iti'oii engines comprising a shank having hearing bosses onthe ends thereof, a longitudinal recess in said shank, a tube within said recess ladeptedqto convey fluid from one end of the sha k 11 the other, and flanges on said shank on opposite sides of recess and extending over said tuhe to secure the same in said re- 7 hfllemme ting mdior internal combusiengines comprising a shank having bearon theends thereof, a longitudinal in said shank having a flange on each side 'fihereofythe extremities of said'flange 7 positioned' cloeely adjacent each other initially cles'e'eeid recess, and means i "3. Acpnnecting -r'odfor intern'alflcombus- 

